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- W2318058895 abstract "Most small wind turbines (1.0 kW and below) furl (aerodynamic/mechanical ability of wind turbine to turn out of the wind) for overspeed protection. Overspeed protection afforded by this furling action protects the rotor and other system components from being stressed beyond the limits for which they were designed. Testing wind turbines that furl has been performed by the USDA-Agricultural Research Service, Bushland, TX, since 1988. One 10 kW wind turbine being tested came close to destruction when a guy cable attachment failed due to excessive vibration. The excessive vibration was caused by the high wind speed necessary to cause the turbine to furl. In November 1997 experimental testing was started on two smaller wind turbines (rated at 0.85 kW and 1.5 kW) to analyze and investigate ways of altering the furling wind speed which could be incorporated in a redesign of the 10 kW wind turbine. These changes involved changing the rotor diameter, the direction of rotor rotation, and the wind turbine electrical load. Increasing the rotor diameter by about 20% resulted in a decrease in furling wind speed of 4 to 5 m/s for the 0.85 kW wind turbine and 2 to 3 m/s for the 1.5 kW wind turbine. Changing the rotor rotation direction gave different results for the two wind turbines, but the larger tilt angle of the 10 kW wind turbine rotor axis may make changing the rotor rotation direction more effective. Applying the electrical load at a lower frequency with a smart conuoller on the 0.85 kW wind turbine resulted in a delay in furling of at least 4 m/s." @default.
- W2318058895 created "2016-06-24" @default.
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- W2318058895 date "1999-01-11" @default.
- W2318058895 modified "2023-09-27" @default.
- W2318058895 title "Experimental testing of changes in wind turbines which affect furling" @default.
- W2318058895 doi "https://doi.org/10.2514/6.1999-57" @default.
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